Strongest Proof is an extra stage in Disgaea D2: A Brighter Darkness. It's unlocked automatically after beating the previous extra stage.
Story[]
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| Episode 1: The Qualities of an Overlord | Nameless Wilderness - Tainted Soil - Silent Death Land - Withered Local Pride - Filthy Ruins |
| Episode 2: The Arrival of the Mysterious Angel Girl Sicily | Unmoving Land - Cold Breath - Ice Demon Grave - Freezing Winds - Winter Ridicule - Silver Witch |
| Episode 3: The Netherworld's Evilest Warrior | Castle Wall Defense - Heartless Main Gate - Evil Plans Foyer - Conspiracy Landing - Corridor of Hell - Inner Sanctum |
| Episode 4: An Idol Overlord is Born!? | Ticket Booth - Merchandise Area - Restricted Area - Green Room - Concert Stage |
| Episode 5: The Celestial Suspicion | Sinful Road - Ghostly Daydream - Scale of Good & Evil - The Floating Lands - Boundary of Darkness - Celestial Gate |
| Episode 6: Etna's Letter | Frightening Forest - Momentary Bravado - Despairing Silence - Animal Trail to Hell - Death Scream Chorus |
| Episode 7: The Truth About Angels | The Fool's Ruins - Evolving Scratches - Overflowing Mirror - Fallen Angel Requiem - Precipitating Hatred - Phantom's End |
| Episode 8: The Overlord's Heir | Dark Impact - Dark Barren Road - Vile Black Crystal - Fallen Destroyer - Shadow of Misfortune - Utopian Abyss |
| Episode 9: The Missing Angels | Ice Beast's Scream - Empty Blooms - Squirming Fear - Wandering Death - Drift of Evil Intent - Netherworld Maw |
| Episode 10: The Eternal Netherworld | Ever Shifting Lands - Ruthless Cave - Netherworld's Crust - Zygote of Pain - Netherworld's Guts |
| Cave of Ordeals | Cave of Ordeals 1 - Cave of Ordeals 2 - Cave of Ordeals 3 - Cave of Ordeals 4 - Cave of Ordeals 5 - Cave of Ordeals 6 |
| Prinny Land | Prinny Land 1 - Prinny Land 2 - Prinny Land 3 - Prinny Land 4 - Prinny Land 5 - Prinny Land X |
| Extra Stages | Idol Declarations - Super Debut Project - Stress Testing - Orders Received - Netherpower Struggle - Mysterious Girl - Red Overlord Search - Behind the Star - Angel's Explanation - Unknown Enemy - Strongest Proof - An Arrogant Betrayal - The Outside Ringer - Tyrant Overlord War |